Direct-current carrier communication system

Abstract

The invention relates to a direct-current carrier communication system which comprises a transmitter and a receiver. The transmitter and the receiver are connected to the same ground wire; wherein the transmitter comprises an N-channel field effect transistor, a P-channel field effect transistor, a first direct current power supply, a second direct current power supply, a first divider resistor, a second divider resistor, a first capacitor and a second capacitor, the grid electrode of the P-channel field effect transistor is connected to the output end of the upper communication machine, and the source electrode of the P-channel field effect transistor is connected to the positive electrode of the first direct current power supply; the grid electrode of the N-channel field-effect transistor is connected to the output end of the upper communication machine, the source electrode of the N-channel field-effect transistor is connected to the negative electrode of the second direct-current power supply, and the drain electrode of the N-channel field-effect transistor is connected to the ground wire through the second divider resistor. Compared with the prior art, the method has the advantages of low energy consumption, wide adaptability and the like.

Description

Technical Field

[0001] This invention relates to the field of power line carrier communication, and in particular to a DC carrier communication system. Background Technology

[0002] Power line carrier communication is widely used in remote areas because it improves the convenience of long-distance communication in remote areas due to its advantage of not requiring separate communication lines.

[0003] Meanwhile, in recent years, power line carrier communication technology has also been gradually applied to some short-range communications. However, traditional power line carrier communication signals are modulated on the neutral or live wire. Since large currents may run on the neutral and live wires, it is necessary to increase the power of the transmitting end, which increases the loss of power line carrier communication.

[0004] In addition, traditional power line carrier communication is generally used in AC lines. When applied to DC power lines, it can cause mutual interference with DC power supply, thus limiting its application scope. Summary of the Invention

[0005] The purpose of this invention is to provide a DC carrier communication system.

[0006] The objective of this invention can be achieved through the following technical solutions:

[0007] A DC carrier communication system includes a transmitter and a receiver;

[0008] Both the transmitter and receiver are connected to the same ground wire;

[0009] in:

[0010] The transmitter includes an N-channel MOSFET, a P-channel MOSFET, a first DC power supply, a second DC power supply, a first voltage divider resistor, a second voltage divider resistor, a first capacitor, and a second capacitor. The gate of the P-channel MOSFET is connected to the output terminal of the host communication unit, the source is connected to the positive terminal of the first DC power supply, and the drain is connected to the ground line through the first voltage divider resistor. The gate of the N-channel MOSFET is connected to the output terminal of the host communication unit, the source is connected to the negative terminal of the second DC power supply, and the drain is connected to the ground line through the second voltage divider resistor. One end of the first capacitor is connected to the positive terminal of the first DC power supply, and the other end is grounded. One end of the second capacitor is connected to the negative terminal of the second DC power supply, and the other end is grounded. The resistance value of the first voltage divider resistor is less than the resistance value of the second voltage divider resistor. The output terminal of the host communication unit outputs a high level of 12V to represent data 1, and outputs a first low level slightly greater than 0V to represent data 0.

[0011] The receiver includes a third voltage divider resistor, a fourth voltage divider resistor, and a comparator. One end of the third voltage divider resistor is connected to the ground wire, and the other end is connected to one end of the fourth voltage divider resistor and the inverting input terminal of the comparator. The non-inverting input terminal of the comparator is connected to the other end of the fourth voltage divider resistor and grounded. The output terminal of the comparator is connected to the input terminal of the lower-level communication device.

[0012] The resistance of the second voltage divider resistor is twice the resistance of the first voltage divider resistor.

[0013] One end of the ground wire is grounded.

[0014] The resistance of the third voltage divider resistor is less than that of the fourth voltage divider resistor.

[0015] The capacitance values ​​of the first capacitor and the second capacitor are equal.

[0016] A DC carrier communication system includes a transmitter and a receiver;

[0017] Both the transmitter and receiver are connected to the same ground wire;

[0018] The transmitter includes an N-channel MOSFET, a P-channel MOSFET, a first DC power supply, a second DC power supply, a first capacitor, and a second capacitor. The gate of the P-channel MOSFET is connected to the output terminal of the host communication unit, the source is connected to the positive terminal of the first DC power supply, and the drain is connected to the ground. The gate of the N-channel MOSFET is connected to the output terminal of the host communication unit, the source is connected to the negative terminal of the second DC power supply, and the drain is connected to the ground. One end of the first capacitor is connected to the positive terminal of the first DC power supply, and the other end is grounded. One end of the second capacitor is connected to the negative terminal of the second DC power supply, and the other end is grounded. The output terminal of the host communication unit outputs a high level of 12V to represent data 1 and outputs -12V to represent data 0.

[0019] The receiver includes a third voltage divider resistor, a fourth voltage divider resistor, and a comparator. One end of the third voltage divider resistor is connected to the ground wire, and the other end is connected to one end of the fourth voltage divider resistor and the inverting input terminal of the comparator. The non-inverting input terminal of the comparator is connected to the other end of the fourth voltage divider resistor and grounded. The output terminal of the comparator is connected to the input terminal of the lower-level communication device.

[0020] Compared with the prior art, the present invention has the following beneficial effects:

[0021] 1. Signal transmission is achieved based on a common ground wire. Since the leakage current to ground of DC power supply is very small, the loss is low, the clamping power is small, and it is not affected by the DC decoupling capacitor of the DC line.

[0022] 2. Based on the design of N-channel and P-channel MOSFETs, combined with the first and second voltage divider resistors, when the upper communication unit outputs a high level of 12V, the N-channel MOSFET conducts while the P-channel MOSFET does not conduct, applying a -12V voltage to the ground. Subsequently, on the receiver side, since the non-inverting input is grounded, the potential of the inverting input is lower than that of the non-inverting input. The receiver outputs a high level of 12V to represent data 1, thus achieving a unified format between the upper and lower communication units without requiring modification to the communication unit. Attached Figure Description

[0023] Figure 1 This is a schematic diagram of the structure of Embodiment 1 of the present invention;

[0024] Figure 2 This is a schematic diagram of the structure of Embodiment 2 of the present invention;

[0025] Wherein: VCC, main power supply; C1, first capacitor; C2, second capacitor; R1, first voltage divider resistor; R2, second voltage divider resistor; R3, third voltage divider resistor; R4, fourth voltage divider resistor; Q1, P-channel MOSFET; Q2, N-channel MOSFET; U1, comparator. Detailed Implementation

[0026] The present invention will now be described in detail with reference to the accompanying drawings and specific embodiments. These embodiments are based on the technical solution of the present invention and provide detailed implementation methods and specific operating procedures. However, the scope of protection of the present invention is not limited to the following embodiments.

[0027] Example 1

[0028] A DC carrier communication system, such as Figure 1 As shown, it includes a transmitter and a receiver;

[0029] Both the transmitter and receiver are connected to the same ground wire;

[0030] The transmitter includes an N-channel MOSFET Q2, a P-channel MOSFET Q1, a first DC power supply, a second DC power supply, a first voltage divider resistor R1, a second voltage divider resistor R2, a first capacitor C1, and a second capacitor C2. The gate of the P-channel MOSFET Q1 is connected to the output terminal of the host communication unit, the source is connected to the positive terminal of the first DC power supply, and the drain is connected to ground through the first voltage divider resistor R1. The gate of the N-channel MOSFET Q2 is connected to the output terminal of the host communication unit, the source is connected to the negative terminal of the second DC power supply, and the drain is connected to ground through the second voltage divider resistor R2. One end of the first capacitor C1 is connected to the positive terminal of the first DC power supply, and the other end is grounded. One end of the second capacitor C2 is connected to the negative terminal of the second DC power supply, and the other end is grounded. The resistance value of the first voltage divider resistor R1 is less than the resistance value of the second voltage divider resistor R2. The host communication unit outputs a high level of 12V to represent data 1, and outputs a first low level slightly greater than 0V to represent data 0.

[0031] The receiver includes a third voltage divider resistor R3, a fourth voltage divider resistor R4, and a comparator U2. One end of the third voltage divider resistor R3 is connected to ground, and the other end is connected to one end of the fourth voltage divider resistor R4, as well as the inverting input of the comparator U2. The non-inverting input of the comparator U2 is connected to the other end of the fourth voltage divider resistor R4 and grounded. The output of the comparator U2 is connected to the input of the lower-level communication device.

[0032] In this embodiment, signal transmission is achieved based on a common ground wire. Since the leakage current to ground of DC power supply is very small, the loss is low, the clamping power is small, and it is not affected by the DC decoupling capacitor of the DC line.

[0033] Based on the design of N-channel MOSFET Q2 and P-channel MOSFET Q1, combined with the first voltage divider resistor R1 and the second voltage divider resistor R2, when the upper communication unit outputs a high level of 12V, the N-channel MOSFET Q2 conducts while the P-channel MOSFET Q1 does not conduct, applying a -12V voltage to the ground. Subsequently, on the receiver side, since the non-inverting input is grounded, the potential of the inverting input is lower than that of the non-inverting input. The receiver outputs a high level of 12V to represent data 1, thus achieving a unified format between the upper and lower communication units without requiring modification to the communication unit.

[0034] Both the first and second DC power supplies are 12V regulated power supplies. Specifically, when the input signal from the host communication unit is 1, the signal level is +12V. At this time, for the P-channel MOSFET Q1, there is no potential difference between the gate and the source, and the P-channel MOSFET Q1 is in the off state. For the N-channel MOSFET Q2, the source is -12V and the gate is +12V, which meets the conduction condition. Therefore, the N-channel MOSFET Q2 is in the conduction state. At this time, the ground potential is pulled to -12V. On the receiver side, under the action of the third voltage divider resistor R3 and the fourth voltage divider resistor R4, the input potential of the inverting input terminal of comparator U2 is: -12×R4 / (R3+R4), which is less than 0, while the potential of the non-inverting input terminal of comparator U2 is 0. The potential of the non-inverting input terminal is greater than the potential of the inverting input terminal, so comparator U2 outputs a high-level signal, and the received signal is 1, thus completing the restoration of the input signal.

[0035] Conversely, when the input signal from the host communication unit is 0, the signal is at a potential of 0. At this time, both P-channel MOSFET Q1 and N-channel MOSFET Q2 are in the conducting state. However, since the first voltage divider resistor R1 is smaller than the second voltage divider resistor R2, the potential on the transmitter output side is greater than 0. Under the action of the third voltage divider resistor R3 and the fourth voltage divider resistor R4, the input potential of the inverting input terminal of comparator U2 is greater than 0, while the potential of the non-inverting input terminal of comparator U2 is 0. Since the potential of the non-inverting input terminal is less than the potential of the inverting input terminal, comparator U2 outputs a low-level signal, and the received signal is 0, thus completing the restoration of the input signal.

[0036] In some embodiments, the resistance of the second voltage divider resistor R2 is twice the resistance of the first voltage divider resistor R1. Thus, the greater the difference between the two, the higher the potential at the inverting input of comparator U2 when the input signal is 0, resulting in a more significant reduction in the failure rate.

[0037] Under normal circumstances, one end of the ground wire is grounded through a large resistor, the resistance of which is at least a thousand times that of the second voltage divider resistor R2.

[0038] In some embodiments, similarly, in order to maximize the absolute value of the potential at the inverting input of comparator U2, the resistance of the third voltage divider resistor R3 is smaller than that of the fourth voltage divider resistor R4.

[0039] Generally, the capacitance values ​​of the first capacitor C1 and the second capacitor C2 are equal.

[0040] Example 2

[0041] A DC carrier communication system, such as Figure 2 As shown, it includes a transmitter and a receiver;

[0042] Both the transmitter and receiver are connected to the same ground wire;

[0043] The transmitter includes an N-channel MOSFET Q2, a P-channel MOSFET Q1, a first DC power supply, a second DC power supply, a first capacitor C1, and a second capacitor C2. The gate of the P-channel MOSFET Q1 is connected to the output terminal of the host communication unit, the source is connected to the positive terminal of the first DC power supply, and the drain is connected to ground. The gate of the N-channel MOSFET Q2 is connected to the output terminal of the host communication unit, the source is connected to the negative terminal of the second DC power supply, and the drain is connected to ground. One end of the first capacitor C1 is connected to the positive terminal of the first DC power supply, and the other end is grounded. One end of the second capacitor C2 is connected to the negative terminal of the second DC power supply, and the other end is grounded. The output terminal of the host communication unit outputs a high level of 12V to indicate data 1 and outputs -12V to indicate data 0.

[0044] The receiver includes a third voltage divider resistor R3, a fourth voltage divider resistor R4, and a comparator U2. One end of the third voltage divider resistor R3 is connected to ground, and the other end is connected to one end of the fourth voltage divider resistor R4, as well as the inverting input of the comparator U2. The non-inverting input of the comparator U2 is connected to the other end of the fourth voltage divider resistor R4 and grounded. The output of the comparator U2 is connected to the input of the lower-level communication device.

[0045] In this embodiment, the main step is to remove the first voltage divider resistor R1 and the second voltage divider resistor R2, thereby reducing the significance of the signal transmitted through the ground wire when the input data is 0.

[0046] The other parts in this embodiment are the same as in Embodiment 1, so they will not be described again.

[0047] If the aforementioned functions are implemented as software functional units and sold or used as independent products, they can be stored in a computer-readable storage medium. Based on this understanding, the technical solution of this invention, or the part that contributes to the prior art, or a part of the technical solution, can be embodied in the form of a software product. This computer software product is stored in a storage medium and includes several instructions to cause a computer device (which may be a personal computer, server, or network device, etc.) to execute all or part of the steps of the methods described in the various embodiments of this invention. The aforementioned storage medium includes various media capable of storing program code, such as USB flash drives, portable hard drives, read-only memory (ROM), random access memory (RAM), magnetic disks, or optical disks.

Claims

1. A DC carrier communication system, comprising a transmitter and a receiver; Its features are, Both the transmitter and receiver are connected to the same ground wire; in: The transmitter includes an N-channel MOSFET, a P-channel MOSFET, a first DC power supply, a second DC power supply, a first voltage divider resistor, a second voltage divider resistor, a first capacitor, and a second capacitor. The gate of the P-channel MOSFET is connected to the output terminal of the host communication unit, the source is connected to the positive terminal of the first DC power supply, and the drain is connected to the ground line through the first voltage divider resistor. The gate of the N-channel MOSFET is connected to the output terminal of the host communication unit, the source is connected to the negative terminal of the second DC power supply, and the drain is connected to the ground line through the second voltage divider resistor. One end of the first capacitor is connected to the positive terminal of the first DC power supply, and the other end is grounded. One end of the second capacitor is connected to the negative terminal of the second DC power supply, and the other end is grounded. The resistance value of the first voltage divider resistor is less than the resistance value of the second voltage divider resistor. The output terminal of the host communication unit outputs a high level of 12V to represent data 1, and outputs a first low level slightly greater than 0V to represent data 0. The receiver includes a third voltage divider resistor, a fourth voltage divider resistor, and a comparator. One end of the third voltage divider resistor is connected to the ground wire, and the other end is connected to one end of the fourth voltage divider resistor and the inverting input terminal of the comparator. The non-inverting input terminal of the comparator is connected to the other end of the fourth voltage divider resistor and grounded. The output terminal of the comparator is connected to the input terminal of the lower-level communication device.

2. The DC carrier communication system according to claim 1, characterized in that, The resistance of the second voltage divider resistor is twice the resistance of the first voltage divider resistor.

3. The DC carrier communication system according to claim 1, characterized in that, One end of the ground wire is grounded.

4. A DC carrier communication system according to claim 1, characterized in that, The resistance of the third voltage divider resistor is less than that of the fourth voltage divider resistor.

5. A DC carrier communication system according to claim 1, characterized in that, The capacitance values ​​of the first capacitor and the second capacitor are equal.

6. A DC carrier communication system, comprising a transmitter and a receiver; Its features are, Both the transmitter and receiver are connected to the same ground wire; in: The transmitter includes an N-channel MOSFET, a P-channel MOSFET, a first DC power supply, a second DC power supply, a first capacitor, and a second capacitor. The gate of the P-channel MOSFET is connected to the output terminal of the host communication unit, the source is connected to the positive terminal of the first DC power supply, and the drain is connected to the ground. The gate of the N-channel MOSFET is connected to the output terminal of the host communication unit, the source is connected to the negative terminal of the second DC power supply, and the drain is connected to the ground. One end of the first capacitor is connected to the positive terminal of the first DC power supply, and the other end is grounded. One end of the second capacitor is connected to the negative terminal of the second DC power supply, and the other end is grounded. The output terminal of the host communication unit outputs a high level of 12V to represent data 1 and outputs -12V to represent data 0. The receiver includes a third voltage divider resistor, a fourth voltage divider resistor, and a comparator. One end of the third voltage divider resistor is connected to the ground wire, and the other end is connected to one end of the fourth voltage divider resistor and the inverting input terminal of the comparator. The non-inverting input terminal of the comparator is connected to the other end of the fourth voltage divider resistor and grounded. The output terminal of the comparator is connected to the input terminal of the lower-level communication device.

7. A DC carrier communication system according to claim 6, characterized in that, The resistance of the second voltage divider resistor is twice the resistance of the first voltage divider resistor.

8. A DC carrier communication system according to claim 6, characterized in that, One end of the ground wire is grounded.

9. A DC carrier communication system according to claim 6, characterized in that, The resistance of the third voltage divider resistor is less than that of the fourth voltage divider resistor.

10. A DC carrier communication system according to claim 6, characterized in that, The capacitance values ​​of the first capacitor and the second capacitor are equal.

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